243 ls6 head dyno results!!

This is a discussion on 243 ls6 head dyno results!! within the Dyno Information forums, part of the Racing Forums category; just wanted to post up some results i got at the dyno today. i know everyone including me likes to ...

That is quite a gain with just stock heads and just bigger rocker arms. What are the stockers? What you did is what I was thinking about. Increase the lift but leaves the cam the same other than that right? My 2000 Z28 and your 98 have the .49X lift cam right?

most of that power is from the rocker arms and tune i would bet ..at least 10-15hp if not more ...the heads of course however play a big role in allow that tune to get more out of your engine...good gains for sure

The heads also bump the compression from 10:1 to 10.5:1 (stock for stock),,,,since they are milled (depending on how much) the compression should be even a tad higher than that.
I'm sure the better exhaust side on those LS6 heads helped as well.

so those rockers bring the duration to around 204/212 and the lift to around 540. definitely happy with these results. only other mods i have planned for this car is a 226EPS cam and a 3600 stall. i hope those will get me to the 420hp range I would be so happy

Decent gains for sure but if my memory serves me well I think the stock cam in the 98 and 99 LS1's were slightly bigger than 01-02.

For a few bucks more an aftermarket baby cam would have been a wiser choice and yield higher gains than to go with 1.85 rockers. But then you'd be spending more in labor cost if you couldn't install it yourself.

the 1.85's were to compliment the heads and kinda hold me over until I have the funds and time to buy/install a cam and the necessary stall converter. converter is def going to a shop to get done so thats like a g-note right there. ill install the cam myself. so im gonna eventually sell the rockers and get an EPS cam in the 226/230 duration range.

Easy to see the LS6 heads are superior, and even at mid lift flow (.400) they beat the LS1 heads by 20 cfm. After that they really take off skunking the LS1 heads by 30 cfm.

I don't see an exhaust side comparison but I do know the LS6 heads have a better I/E ratio, and with 5 more CC's, with a D shaped exhaust port for a better short turn radius I'll bet the exhaust side also has comparable gains over the LS1 head.

Easy to see the LS6 heads are superior, and even at mid lift flow (.400) they beat the LS1 heads by 20 cfm. After that they really take off skunking the LS1 heads by 30 cfm.

I don't see an exhaust side comparison but I do know the LS6 heads have a better I/E ratio, and with 5 more CC's, with a D shaped exhaust port for a better short turn radius I'll bet the exhaust side also has comparable gains over the LS1 head.

Great info I wish I had flow numbers on mine since they were massaged a bit

Thanks for posting the flow numbers Firebird
The 243 heads are a bit more efficient and explains why you can't run as much ignition advace with them compared to LS1 castings. Stick the later Z06 cam in there and you'll have some really nice numbers and awesome stock driveability. I have an LQ9 (same port style as 243/LS2 with larger chambers) with the Z06 cam and less compression than you. With bolt ons I rolled 371/380 at the tires... so I imagine you'd roll close to 390.

Thanks for posting the flow numbers Firebird
The 243 heads are a bit more efficient and explains why you can't run as much ignition advace with them compared to LS1 castings. Stick the later Z06 cam in there and you'll have some really nice numbers and awesome stock driveability. I have an LQ9 (same port style as 243/LS2 with larger chambers) with the Z06 cam and less compression than you. With bolt ons I rolled 371/380 at the tires... so I imagine you'd roll close to 390.

You're welcome. An LQ9 with an LS6 cam? That ought to be a torquey little setup. I like the sound of that.